what does NSA ( 7passes ) do?
1
a noob question about NSA (7passes)
Started by ecw, Jul 21 2007 06:57 AM
2 replies to this topic
#2 OFFLINE
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Posted 21 July 2007 - 10:17 AM
It over-writes a file seven times, in effect, erasing (or shredding) it. Such a file is not normally recoverable, if at all. In fact a file overwritten at all is difficult to recover, 3 would be considered pretty secure, 7 very, and there is an overwriting protocol called the Gnutman (named for the Author) which overwrites 35 times, for the truly paranoid.
Just deleting a file merely gets rid of the header information; the remainder of the file is left behind and if not overwritten, can be easily recovered. Overwriting a file takes a bit longer than just deleting it.
(I think NSA stands for No Such Agency..7 overwrites is the protocol they consider adequate to destroy a file.)
Just deleting a file merely gets rid of the header information; the remainder of the file is left behind and if not overwritten, can be easily recovered. Overwriting a file takes a bit longer than just deleting it.
(I think NSA stands for No Such Agency..7 overwrites is the protocol they consider adequate to destroy a file.)
#3 OFFLINE
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Posted 21 July 2007 - 05:19 PM
Tarq57, on Jul 21 2007, 06:17 AM, said:
It over-writes a file seven times, in effect, erasing (or shredding) it. Such a file is not normally recoverable, if at all. In fact a file overwritten at all is difficult to recover, 3 would be considered pretty secure, 7 very, and there is an overwriting protocol called the Gnutman (named for the Author) which overwrites 35 times, for the truly paranoid.
Just deleting a file merely gets rid of the header information; the remainder of the file is left behind and if not overwritten, can be easily recovered. Overwriting a file takes a bit longer than just deleting it.
(I think NSA stands for No Such Agency..7 overwrites is the protocol they consider adequate to destroy a file.)
Just deleting a file merely gets rid of the header information; the remainder of the file is left behind and if not overwritten, can be easily recovered. Overwriting a file takes a bit longer than just deleting it.
(I think NSA stands for No Such Agency..7 overwrites is the protocol they consider adequate to destroy a file.)
nsa is some sort of gov orgazation from eraser hompage: Other methods include the one defined in the National Industrial Security Program Operating Manual of the US Department of Defence and overwriting with pseudorandom data.
